Question

What determines the number of elements found in each period in the periodic table?

Answer 1

Principle Quantum number is the number that tells you about the main shell in which the electron is present.And Azimuthal number is the number that tells you about the sub-shell to which the electron belongs to. Let us consider the period 3 which consists of elements like Na,Mg,Al,Si,P,S,Cl,Ar.

Answer 2

hey buddy,
here is your answer,


Principle Quantum number is the number that tells you about the main shell in which the electron is present.And Azimuthal number is the number that tells you about the sub-shell to which the electron belongs to.

Let us consider the period 3 which consists of elements like Na,Mg,Al,Si,P,S,Cl,Ar. There are totally 8 elements by counting them. Argon's configuration is [Ne] 3s2, 3p6.

Because it is the third period the electrons can be filled only in 3s and 3p and now the orbitals present in 3s is 1 and in 3p it is 3, by adding them we get 4.

We know that each orbital contains 2 electrons and so it will be 4*2 that is it can accommodate 8 electrons.

Hence, the third period should have 8 elements.
It follows to other periods too, you can check it.

I HOPE THIS HELPS YOU
I REQUEST YOU TO MARK ME AS BRAINLIEST